import pygame
from pygame.locals import *
import sys
import random

# Initialize pygame
pygame.init()

# Vector for easy 2D calculations
vec = pygame.math.Vector2

# Screen dimensions
HEIGHT = 400
WIDTH = 450

# Physics constants
ACC = 0.5
FRIC = -0.12

# Frames per second
FPS = 60
FramePerSec = pygame.time.Clock()

# Set up display
displaysurface = pygame.display.set_mode((WIDTH, HEIGHT))
pygame.display.set_caption("Game")

# Player class
class Player(pygame.sprite.Sprite):
    def __init__(self):
        super().__init__()
        self.surf = pygame.Surface((30, 30))
        self.surf.fill((128, 255, 40))
        self.rect = self.surf.get_rect()
        self.pos = vec((10, 360))
        self.vel = vec(0, 0)
        self.acc = vec(0, 0)
        self.jumping = False
        self.max_jump_height = -15  # Max jump height

    def move(self):
        self.acc = vec(0, 0.5)
        pressed_keys = pygame.key.get_pressed()
        if pressed_keys[K_LEFT]:
            self.acc.x = -ACC
        if pressed_keys[K_RIGHT]:
            self.acc.x = ACC
        self.acc.x += self.vel.x * FRIC
        self.vel += self.acc
        self.pos += self.vel + 0.5 * self.acc
        if self.pos.x > WIDTH:
            self.pos.x = 0
        if self.pos.x < 0:
            self.pos.x = WIDTH
        self.rect.midbottom = self.pos

    def jump(self):
        if not self.jumping:
            hits = pygame.sprite.spritecollide(self, platforms, False)
            if hits:
                self.jumping = True
                self.vel.y = self.max_jump_height

    def cancel_jump(self):
        if self.jumping and self.vel.y < -3:
            self.vel.y = -3

    def update(self):
        hits = pygame.sprite.spritecollide(self, platforms, False)
        if self.vel.y > 0 and hits:
            if self.pos.y < hits[0].rect.bottom:
                self.pos.y = hits[0].rect.top + 1
                self.vel.y = 0
                self.jumping = False

# Platform class
class Platform(pygame.sprite.Sprite):
    def __init__(self):
        super().__init__()
        self.surf = pygame.Surface((random.randint(50, 100), 12))
        self.surf.fill((0, 255, 0))
        self.rect = self.surf.get_rect(center=(random.randint(0, WIDTH - 10),
                                               random.randint(0, HEIGHT - 30)))

    def move(self):
        pass  # Platforms don't move, but this can be modified for moving platforms

# Collision check to prevent overlapping
def check(platform, groupies):
    if pygame.sprite.spritecollideany(platform, groupies):
        return True
    for entity in groupies:
        if entity == platform:
            continue
        if (abs(platform.rect.top - entity.rect.bottom) < 50) and \
           (abs(platform.rect.bottom - entity.rect.top) < 50):
            return True
    return False

# Generate new platforms (spawn higher off screen)
def plat_gen():
    while len(platforms) < 6:
        width = random.randrange(50, 100)
        p = Platform()
        C = True
        while C:
            p = Platform()
            p.rect.center = (random.randrange(0, WIDTH - width),
                             random.randrange(-120, -40))  # ← FIX: spawn above view
            C = check(p, platforms)
        platforms.add(p)
        all_sprites.add(p)

# Modify base platform to act as ground
PT1 = Platform()
PT1.surf = pygame.Surface((WIDTH, 20))
PT1.surf.fill((255, 0, 0))
PT1.rect = PT1.surf.get_rect(center=(WIDTH / 2, HEIGHT - 10))

# Sprite groups
all_sprites = pygame.sprite.Group()
all_sprites.add(PT1)

platforms = pygame.sprite.Group()
platforms.add(PT1)

# Initial platforms
for _ in range(random.randint(4, 5)):
    pl = Platform()
    while check(pl, platforms):
        pl = Platform()
    platforms.add(pl)
    all_sprites.add(pl)

# Main game loop
P1 = Player()
all_sprites.add(P1)

while True:
    P1.update()

    for event in pygame.event.get():
        if event.type == QUIT:
            pygame.quit()
            sys.exit()
        if event.type == KEYDOWN and event.key == K_SPACE:
            P1.jump()
        if event.type == KEYUP and event.key == K_SPACE:
            P1.cancel_jump()

    # Scroll world up if player goes too high
    if P1.rect.top <= HEIGHT / 3:
        P1.pos.y += abs(P1.vel.y)
        for plat in platforms:
            plat.rect.y += abs(P1.vel.y)
            if plat.rect.top >= HEIGHT:
                plat.kill()

    plat_gen()
    displaysurface.fill((0, 0, 0))

    # Draw all sprites
    for entity in all_sprites:
        displaysurface.blit(entity.surf, entity.rect)
        entity.move()

    pygame.display.update()
    FramePerSec.tick(FPS)